linux-kernel - [PATCH 0/2] usb: gadget: f

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Message-Id: <20260108-ffs-dmabuf-ioctl-fix-v1-0-e51633891a81@samcday.com>
Date: Thu, 08 Jan 2026 08:30:19 +1000
From: Sam Day via B4 Relay <devnull+me.samcday.com@...nel.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Sam Day <me@...cday.com>, David Heidelberg <david@...t.cz>
Subject: [PATCH 0/2] usb: gadget: f_fs: DMA-BUF fixes

I recently started kicking the tires on DMA-BUF support in FunctionFS.
In the process, I found a couple of issues that are fixed in this
series.

One issue is a minor bug in how the ioctl handler treats invalid calls.
The other is more serious and breaks DMA transfers on systems with a
tenacious SMMU.

I created a fairly minimal reproducer of the DMA issue in this gist, to
assist in testing:

https://gist.github.com/samcday/d23aaf95be678bcdd1dd62b4b79861ea

Tested on:
 - Pixel 3a
 - OnePlus 6T

Signed-off-by: Sam Day <me@...cday.com>
---
Sam Day (2):
      usb: gadget: f_fs: Fix ioctl error handling
      usb: gadget: f_fs: fix DMA-BUF OUT queues

 drivers/usb/gadget/function/f_fs.c | 24 +++++++++---------------
 1 file changed, 9 insertions(+), 15 deletions(-)
---
base-commit: f0b9d8eb98dfee8d00419aa07543bdc2c1a44fb1
change-id: 20251114-ffs-dmabuf-ioctl-fix-272497182f86

Best regards,
-- 
Sam Day <me@...cday.com>